Surname アグン (Agung 
, Tirtayasa 
, アグン ) , all over the world, is a widespread last name. The surname アグン is characteristic of South-eastern Asia, particularly Indonesia, where it is quite a common surname, Brunei, where it is quite a rare surname, and Malaysia. Measured by absolute frequency, the name is most common in Indonesia, Malaysia, and Saudi Arabia. More prevalently, アグン is the forename as well as the last name.